This is a brand new, premium quality compatible replacement spool and line for your Gardenline strimmer/trimmer. The spool and line are designed for Gardenline strimmers and trimmers and are compatible with the GLR451 model. The specification includes a width of 1.5 mm and a length of 2 x 9m. The dimensions are: Height: 28mm, Cog Outer Diameter: 76mm, Top Diameter: 72mm, Cog Hole Diameter: 26mm. Please note that all dimensions are approximate and may vary slightly.